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Dissolution, sorption/(re)precipitation, formation of solid solutions and crystal growth phenomena on mineral surfaces: implications for the removal of toxic metals from the environment

By
Athanasios Godelitsas
Athanasios Godelitsas
1
Department of Mineralogy and Petrology, National and Kapodistrian University of Athens, Panepistimioupoli, Zographou 15784, Greece e-mail: agodel@geol.uoa.gr
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;
José M. Astilleros
José M. Astilleros
2
Department of Crystallography and Mineralogy, Complutense University of Madrid,28040 Madrid 28040, Spain
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Published:
January 01, 2011

Abstract

Sorption of dissolved heavy metals, at low-temperature conditions, mediated by mineral surfaces, plays an important role in controlling both the dispersion and accumulation of these pollutants as well their geoavailability and bioavailabity in near-surface environments. In parallel to sorption, dissolution of mineral surfaces always occurs as an unavoidable coupled phenomenon at the mineral-water interface. The main sorp-tion mechanisms, related to metal uptake from aqueous solutions, can be considered absorption (including ion-exchange), adsorption and surface (co)/(re)precipitation leading to subsequent crystal-growth phenomena and formation of solid-solutions. The mineral reactivity depends on the chemical composition of the interacting solid, which in turn is related to particular physicochemical characteristics such as the porosity, the specific surface area (SSA), the cation exchange capacity (CEC), and the zeta-potential/pHPZ. Of special interest, for industrial and environmental technology, is the interaction of carbonate (e.g. calcite), sulphate (e.g. gypsum) as well as aluminosilicate and Mn-oxide micro/nanoporous minerals (e.g. various zeolites and todorokite) with ‘ultra’ heavy toxic metals including actinides (e.g. Hg, Pb, Th, U).

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Contents

European Mineralogical Union Notes in Mineralogy

Ion Partitioning in Ambient-Temperature Aqueous Systems

M. Prieto
M. Prieto
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;
H. Stoll
H. Stoll
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Mineralogical Society of Great Britain and Ireland
Volume
10
ISBN electronic:
9780903056441
Publication date:
January 01, 2011

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